Connection to DB

Connect to MySQL

PHP5 and later can work with a MySQL database using 

• 　　MySQLi extension
• 　　PDO

PDO will work on 12 different database systems, where as MySQLi will only work with MySQL database.

<!-- MySQLi Object-Oriented -->

<?php

　　$servername = "localhost";

　　$username = "username";

　　$password = "pwd";

　　

　　//create  connection

　　$conn = new mysqli($servername, $username, $password);

　　//check connection

　　if($conn-> conncet_error){

　　　　die("Connection failed:" .$conn->connect_error);

　　}

　　echo "Connected successfully";

　　$conn->close();

?>

<!-- MySQLi Procedual -->

<?php

　　$servername = "localhost";

　　$username = "username";

　　$password = "pwd";

　　//create connection

　　$conn = mysqli_connect($servername, $username, $password);

　　//check connection

　　if(!$conn){

　　　　die("Connection failed:" .mysqli_connect_error());

　　}

　　echo "Connected successfully";

　　mysql_close($conn);

?>

<!-- PDO -->

<?php

　　$servername = "localhost";

　　$username = "username";

　　$password = "pwd";

　　try{

　　　　$conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password);

　　　　//set the PDO error mode to exception

　　　　$conn ->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

　　　　echo "Connection successfully";

　　　　$conn = null;

　　}

　　catch(PDOException $e){

　　　　echo "Connection failed:" .$e->getMessage();

　　}

?>